CVE-2016-4480

2016-05-1800:00:00

ubuntu.com

8.4 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

7.2 High

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

0.002 Low

EPSS

Percentile

51.4%

JSON

The guest_walk_tables function in arch/x86/mm/guest_walk.c in Xen 4.6.x and
earlier does not properly handle the Page Size (PS) page table entry bit at
the L4 and L3 page table levels, which might allow local guest OS users to
gain privileges via a crafted mapping of memory.

Bugs

<https://launchpad.net/bugs/1583960>

OSVersionArchitecturePackageVersionFilename
ubuntu12.04noarchxen< 4.1.6.1-0ubuntu0.12.04.11UNKNOWN
ubuntu14.04noarchxen< 4.4.2-0ubuntu0.14.04.6UNKNOWN
ubuntu15.10noarchxen< 4.5.1-0ubuntu1.4UNKNOWN
ubuntu16.04noarchxen< 4.6.0-1ubuntu4.1UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	12.04	noarch	xen	< 4.1.6.1-0ubuntu0.12.04.11	UNKNOWN
ubuntu	14.04	noarch	xen	< 4.4.2-0ubuntu0.14.04.6	UNKNOWN
ubuntu	15.10	noarch	xen	< 4.5.1-0ubuntu1.4	UNKNOWN
ubuntu	16.04	noarch	xen	< 4.6.0-1ubuntu4.1	UNKNOWN